list1.append(6)
print(list1)
list2=[1,2,3]
print(list2)
list3=list()
print(list3)

for i in list2:
    print(i)
list2.insert(1,10)
print(list2)
list2.extend([11,12])
print(list2)
list2.sort(reverse=True)
print(list2)
print("=================")
list3=sorted(list2)
print(list3)
# del list3
# print(list3)
list4=[1,3,5,7,9]

list5=[i**2 for i in range(1,10) if i%2!=0]
print(list5)

str=('1111','2222')
print(type(str))